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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.228

Synced skills no longer have file attachments extracted, except when remote

You'll notice
Useful2 Signal3
Skills

Account-synced skills no longer have file attachments pulled out, except on remote or Cowork runs.

What

Skills that arrive through skill syncing now skip file-attachment extraction from their content, matching how skills from MCP servers and the memory store already behaved. The exception is remote or cowork runs, where extraction still happens.

Details
  • The remote check is CLAUDE_CODE_REMOTE or CLAUDE_CODE_IS_COWORK; either being set restores extraction for synced skills.
  • The previous rule was a per-source list that skipped extraction only for mcp and memoryStore skills.
Evidence

if (e.loadedFrom === "syncedSkills") return !Jy_();

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.228 →